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Biology µGCSE:

Homeostasis

10 quick questions - for GCSE and iGCSE

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10 minutes maximum! (can you do it in 5?)

 

Triple science only! Not for double award / combined science

1-5: This diagram models a homeostatic mechanism.

e.g. Body temperature has a set point of around 37oC. When the body temperature rises temperature receptors in the skin are stimulated and send impulses to the control centre in the hypothalamus.

Nervous impulses are sent to the skin to stimulate effectors to bring down the body temperature to the set point.

 

1. The homeostatic process that brings about a response to return the body to the ‘set point’ is called ...

  • A. digestion
  • B. negative feedback
  • C. positive feedback
  • D. excretion
2. The water content of the blood is monitored (receptor and control centre) by the ...
  • A. pituitary
  • B. kidney
  • C. liver
  • D. pancreas
3. The hormone that causes an increased reabsorption of water in the kidneys is ...
  • A. insulin
  • B. testosterone
  • C. ADH
  • D. adrenalin
4. If the amount of water in the blood becomes too low the cells of the body may lose water through the process of ...
  • A. diffusion
  • B. osmosis
  • C. dehydration
  • D. homeostasis
5. The body temperature of humans is kept constant at around what temperature?
  • A. 25oC
  • B. 98oC
  • C. 37oC
  • D. 30oC

6-9: The skin has an important role in maintaining our body temperature.

The diagram shows a cross-section through a layer of skin:

 

glucose levels in blodd - graph
adapted from Tienp | pixabay

6.  Using the diagram, which letter is the sweat gland?

7. In hot weather which of the following is correct?

  Hair Hair erector muscle
A Stands away from the skin relaxed
B Stands away from the skin contracted
C Lies flat on skin relaxed
D Lies flat on skin contracted
8. If a person’s body temperature becomes too low vasoconstriction occurs.  In which structure does vasoconstriction occur?

9. Vasoconstriction results in which of the following?

  Heat radiated from skin Colour of skin
A increases red
B increases blue
C decreases red
D decreases blue
10. The control centre for our body temperature is ...
  • A. the pituitary
  • B. the nerve endings in the skin
  • C. the liver
  • D. the hypothalamus